EP1120692B1 - Dispositif electrophotographique de developpement de liquide colorant - Google Patents

Dispositif electrophotographique de developpement de liquide colorant Download PDF

Info

Publication number
EP1120692B1
EP1120692B1 EP00944302A EP00944302A EP1120692B1 EP 1120692 B1 EP1120692 B1 EP 1120692B1 EP 00944302 A EP00944302 A EP 00944302A EP 00944302 A EP00944302 A EP 00944302A EP 1120692 B1 EP1120692 B1 EP 1120692B1
Authority
EP
European Patent Office
Prior art keywords
roller
toner
intermediate transfer
carrier
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00944302A
Other languages
German (de)
English (en)
Other versions
EP1120692A4 (fr
EP1120692A1 (fr
Inventor
Yutaka PFU Limited Nakashima
Akihiko PFU Limited Inamoto
Shigeki PFU Limited Uesugi
Satoru PFU Limited Moto
Masanari PFU Limited Takabatake
Motoharu PFU Limited Ichida
Shigeharu PFU Limited Okano
Seiichi PFU Limited Takeda
Hironaga PFU Limited HONGAWA
Hitoshi PFU Limited TERASHIMA
Satoshi PFU Limited SAKAI
Satoshi PFU Limited MIYAMOTO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PFU Ltd
Original Assignee
PFU Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by PFU Ltd filed Critical PFU Ltd
Publication of EP1120692A1 publication Critical patent/EP1120692A1/fr
Publication of EP1120692A4 publication Critical patent/EP1120692A4/fr
Application granted granted Critical
Publication of EP1120692B1 publication Critical patent/EP1120692B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/161—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support with means for handling the intermediate support, e.g. heating, cleaning, coating with a transfer agent
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/16—Transferring device, details
    • G03G2215/1676—Simultaneous toner image transfer and fixing
    • G03G2215/1695—Simultaneous toner image transfer and fixing at the second or higher order transfer point

Definitions

  • the present invention relates to a liquid-toner-development-type electrophotographic apparatus. More particularly, the invention relates to a liquid-toner-development-type electrophotographic apparatus in which a toner layer on an intermediate transfer member is melted through application of heat to separate a carrier solvent and a solid component from each other, and the carrier solvent is then removed.
  • a conventionally known liquid-toner-development-type electrophotographic apparatus uses as a liquid developer a highly viscous liquid toner composed of a liquid carrier (oil) and solid particles, such as pigment, which are dispersed in the liquid carrier (as disclosed in, for example, Japanese Patent Application Laid-Open ( kokai ) No. 11-25290 ).
  • a powder toner involves the following problems: toner particles scatter; and toner particles have a relatively large particle size of 7 ⁇ m to 10 ⁇ m; resulting in poor resolution.
  • a liquid toner has a small toner particle size of about 1 ⁇ m and can hold a large amount of electrostatic charge. Thus, a toner image is unlikely to be disturbed, and high resolution can be achieved.
  • FIG. 4 shows the overall configuration of a conventional liquid-toner-development-type electrophotographic apparatus.
  • a photosensitive drum 10 is electrostatically charged at about 700 V by means of a charger 11. Subsequently, the photosensitive drum 10 is exposed to light by means of an exposure unit 12, whereby an electrostatic latent image is formed such that an exposed portion assumes an electric potential of about 100 V.
  • a prewetting unit 13 applies silicone oil having a viscosity of about 20 cSt to the surface of the photosensitive drum 10, to a thickness of 4 ⁇ m to 5 ⁇ m.
  • Developing units 14 corresponding to yellow, magenta, cyan, and black are provided and use as a liquid developer a nonvolatile toner of high viscosity and high concentration having a toner viscosity of 400 mPa ⁇ S to 4000 mPa ⁇ S and a carrier viscosity of 20 cSt.
  • a developing roller supplies the liquid developer while being in contact with the photosensitive drum 10, in such a manner as to maintain a two-layer structure composed of a toner layer on the developing roller and a prewetting liquid film on the photosensitive drum 10, to thereby cause toner particles contained in the liquid developer to adhere to the photosensitive drum 10 according to an electric field established between the same and the photosensitive drum 10.
  • An intermediate transfer member 15 is biased at about - 500 V to thereby transfer toner particles thereto from the photosensitive drum 10 in the order of yellow, magenta, cyan, and black according to an electric field established between the same and the photosensitive drum 10.
  • a backup roller 20 is adapted to fix on printing paper the toner which is present on the intermediate transfer member 15 and is melted by means of a heating unit 18. The heating unit 18 heats a portion of the surface of the intermediate transfer member 15 at a position located upstream of the backup roller 20.
  • a carrier solvent used in liquid development is intended to prevent scattering of toner particles, which assume a particle size of about 1 ⁇ m, as well as to uniformly disperse toner particles through electrification of the toner particles.
  • the carrier solvent serves as a "bridge" to facilitate movement of toner particles, which is effected by means of electric-field action.
  • the carrier solvent is a component necessary for storage of toner, transport of toner, formation of a toner layer, and electrostatic transfer of toner.
  • the carrier solvent is a component unnecessary for obtainment of good picture quality.
  • a volatile insulating liquid is used as a carrier solvent in many liquid developers (liquid toners).
  • an electrophotographic apparatus which uses a liquid developer using a nonvolatile carrier solvent; for example, an HVS (High-Viscosity Silicone) toner, as shown in FIG. 4 , is developed.
  • a liquid-development toner using a nonvolatile carrier solvent may involve the following problem: the carrier solvent cannot be volatilized during melting of toner through application of heat to the liquid toner and, particularly during fixation of toner or thermal transfer of a toner image, hinders development of adhesion of a molten toner onto a paper medium, resulting in a failure to attain satisfactory picture quality and fixation strength with respect to a toner image transferred onto the paper medium.
  • the intermediate transfer member 15 must be heated by appropriate heating means located outside or inside the same.
  • this configuration involves the following problems: since the intermediate transfer member 15 is heated at all times, the photosensitive drum 10 is heated, with a resultant deterioration in photosensitive properties; since, during removal of a carrier, a toner image is in a molten state through exposure to heat, the toner image is disturbed due to adhesion to a carrier-removing roller, resulting in an impairment in picture quality; and in a process of superposing toner images, a toner image which has previously been electrostatically transferred is in a molten state through exposure to heat and is thus disturbed during contact with the photosensitive drum, resulting in an impairment in picture quality.
  • FIG. 3 shows heating and cooling mechanisms proposed in the above filed application.
  • toner particles transferred from a photosensitive drum 10 to an intermediate transfer belt 24 are melted through application of heat.
  • the molten toner is transferred onto a printing medium, such as paper, in a single operation.
  • a backup roller 20 abuts a heating roller 25 under pressure so as to fix the molten toner onto the medium, such as printing paper.
  • the intermediate transfer belt 24 is looped around a plurality of tension rollers 26 and 27, the heating roller 25, and the cooling roller 23.
  • a carrier-removing roller 21 is disposed in contact with the surface of the intermediate transfer belt 24 at a position located upstream of a position where the intermediate transfer belt 24 comes into contact with the heating roller 25.
  • a bias potential is applied to the carrier-removing roller 21 while a conductive roller 19 located in opposition to the heating roller 25 is grounded, thereby removing excessive carrier as well as prewetting liquid without exerting an electrical influence an other processes, such as electrostatic transfer and thermal transfer.
  • excessive carrier solvent cannot be completely removed.
  • Various proposals have been put forth for removing as much carrier solvent as possible from a toner image an the photosensitive drum or the intermediate transfer member.
  • US-A 5,150,161 discloses an apparatus to transfer a liquid toned image to a final receiving surface.
  • a liquid carrier for the toner is removed from the toner particles by an air knife or air dryer.
  • WO-A 9423347 discloses an imaging apparatus for forming liquid toner images.
  • Carrier liquid for the toner is removed of an intermediate transfer member by an air blower.
  • EP-A 0642062 discloses an imaging apparatus with a transfer roller 50 being also a heating fixing means and a carrier removing roller 90 on the intermediate transfer member 30 located downstream of the heated transfer roller 50 and upstream the abutment with the photosensitive drum 11.
  • This transfer roller 50 is used for heating under pressure and fixing the toner images in the four colors on the transfer paper P and operates after the carrier removing roller 90 removes nonvolatile carrier solvents from the toner images.
  • An object of the present invention is to provide a liquid-toner-development-type electrophotographic apparatus in which the nonvolatile carrier solvent remains in a toner image on an intermediate transfer member and in which residual carrier solvent which is not removed in a carrier-removing process conducted before a heating process can be efficiently removed through utilization of a phenomenon that toner particles (resin component) are melted and integrated in the heating process and a phenomenon that a carrier solvent (liquid component) is isolated in the heating process.
  • a toner image is transferred from a photosensitive member onto an intermediate transfer member, and toner particles transferred onto the intermediate transfer member are melted through application of heat and transferred onto a printing medium.
  • a carrier-removing roller which serves as means for removing the carrier solvent from the intermediate transfer member while the toner layer on the intermediate transfer member is being melted through application of heat, at a position where the toner layer is melted through application of heat.
  • the present invention is characterized by comprising at least the means for removing the carrier solvent while the toner layer is melted through application of heat and may also comprise the means for removing the carrier solvent after the toner layer is melted through application of heat.
  • the present invention may comprise both of the means and may further comprise means for removing the carrier solvent (a carrier-removing roller) disposed upstream of the position where the toner layer on the intermediate transfer member is heated.
  • a carrier-removing roller means for removing the carrier solvent
  • the liquid-toner-development-type electrophotographic apparatus of the present invention can separate the carrier solvent and the solid component to thereby remove the carrier solvent, by melting, through application of heat, the toner layer which is formed on the intermediate transfer member and contains a nonvolatile oil component trapped between toner particles.
  • the electrophotographic apparatus shown in FIG. 1 is configured such that an intermediate transfer belt 24 is looped around a tension roller 27, a heating roller 25 having a heating mechanism, and a cooling roller 23.
  • the intermediate transfer belt 24 undergoes repeatedly the following cycles of heating and cooling: the surface of the intermediate transfer belt 24 is heated to a temperature of, for example, 150°C by means of a heating roller 25; and the intermediate transfer belt 24 is cooled to a temperature of, for example, 40°C by means of the cooling function of the cooling roller 23.
  • the intermediate transfer belt 24 can be driven by means of any roller.
  • the heating roller 25 may have a drive mechanism.
  • the heating roller 25 may be an aluminum roller which can be heated by an internally disposed heat source, such as a halogen lamp.
  • the apparatus is configured such that a carrier-removing roller 21 which abuts the surface of the intermediate transfer belt 24 is disposed upstream of a position where the intermediate transfer belt 24 comes into contact with the heating roller 25.
  • the carrier-removing roller 21 is biased at, for example, +3 KV to thereby remove not only excessive carrier but also presetting liquid.
  • a conductive roller 19, which abuts the intermediate transfer belt 24 from inside in opposition to the carrier-removing roller 21, is grounded, whereby a bias can be applied to the carrier-removing roller 21 without exerting an electrical influence on other processes, such as electrostatic transfer and thermal transfer.
  • the intermediate transfer belt 24 is biased at about - 500 V, whereby toner particles adhering to a photosensitive member 10 are transferred onto the intermediate transfer belt 24 according to an electric field established between the same and the photosensitive element 10.
  • Toner particles in each of four colors are transferred from the photosensitive element 10 onto the intermediate transfer belt 24; i.e., a total of four transfers are involved. For example, first, yellow toner particles adhering to the photosensitive member 10 are transferred. Next, magenta toner particles adhering to the photosensitive member 10 are transferred. Then, cyan toner particles adhering to the photosensitive member 10 are transferred. Next, black toner particles adhering to the photosensitive member 10 are transferred.
  • toner particles transferred onto the intermediate transfer belt 24 are melted through application of heat.
  • the thus-molten toner is transferred onto a printing medium, such as paper, in a single operation.
  • a backup roller 20 abuts the heating roller 25 under pressure so as to fix the molten toner onto the medium, such as printing paper.
  • the above-described configuration is substantially the same as the previously proposed configuration ( FIG. 3 ).
  • removal of a carrier after heating and removal of a carrier during heating which are features of the present invention, will be described with reference to the illustrated liquid-development-type electrophotographic apparatus, which employs the intermediate transfer belt 24 serving as the intermediate transfer member and includes the cooling roller 23.
  • the present invention is not limited to the electrophotographic apparatus which employs the belt serving as the intermediate transfer member, but is applicable to an electrophotographic apparatus which employs a drum serving as the intermediate transfer member and does not employ a cooling roller.
  • Means for removing a carrier after heating is disposed downstream of a position where a toner layer on the intermediate transfer member is heated by means of the heating roller 25, and upstream of a position where the toner layer again abuts the photosensitive member 10.
  • carrier-removing roller 29 abuts the intermediate transfer belt 24 at a position located downstream of a position where the intermediate transfer belt 24 leaves the heating roller 25, and upstream of a position where the intermediate transfer belt 24 is looped around the cooling roller.
  • the toner layer on the intermediate transfer member is in a state observed when the toner layer is once heated to a temperature equal to or higher than at least the glass transition point to thereby be melted and then cools down to a temperature equal to or lower than the glass transition point due to release of heat.
  • the toner is in a nonadhesive state.
  • the position is located upstream of a position where the second color toner and other color toners are each superposed on the toner through transfer.
  • the carrier-removing roller 29 efficiently removes the carrier solvent which, when the toner is melted and integrated on a portion of the intermediate transfer belt 24 looped around the heating roller 25, separates from a molten toner resin component and floats on the surface of the toner layer, thereby preventing a deterioration in efficiency and image during transfer of each of the second color toner and other color toners.
  • a conductive roller 30, which abuts the intermediate transfer belt 24 from inside in opposition to the carrier-removing roller 29, is grounded, whereby a bias can be applied to the carrier-removing roller 29 without exerting an electrical influence on other processes, such as electrostatic transfer and thermal transfer.
  • the means for removing the carrier after heating can assume the form of the carrier-removing roller 29 and can be configured such that the surface of the carrier-removing roller 29 moves at the same speed in the same direction as does the surface of the intermediate transfer belt 24 which the surface of the carrier-removing roller 29 abuts.
  • the carrier-removing roller 29 is provided with an unillustrated blade or counter roller (a roller which rotates such that surfaces in contact with each other move in mutually opposite directions) in contact with the same. The blade or counter roller scrapes off the carrier solvent from the carrier-removing roller 29.
  • the carrier-removing roller 23 is brought in press contact with a so-called “belly portion” of the intermediate transfer belt 24 (an intermediate portion which extends between rollers and is not looped around rollers, such as the heating roller 25 and the cooling roller 23), thereby establishing soft stable contact.
  • the carrier-removing roller 29 also plays the role of a tension roller.
  • a roller which rotates in the same direction at the same speed as does the intermediate transfer belt 24 can remove only half of the carrier solvent emerging on the surface of the intermediate transfer belt 24. Toner which is once melted through application of heat is fixedly attached to the surface of the intermediate transfer belt 24 (even when the surface is coated with a release coat), although the attachment is not firm.
  • the carrier-removing roller 29 for removing the carrier after heating is rotated in reverse (rotated in the counter direction such that surfaces in contact with each other move in mutually opposite directions) with respect to rotation of the intermediate transfer belt 24 while maintaining soft contact with the intermediate transfer belt 24, thereby scraping off only carrier liquid.
  • the carrier-removing roller 29 can be formed such that the surface of a foamed material is coated with a fluorine-containing resin tube, thereby establishing uniform, soft press contact with the belt surface.
  • the electrophotographic apparatus of the present invention can employ means for removing the carrier solvent (carrier-removing roller 28) while the toner layer on the intermediate transfer member is being melted through application of heat by means of the heating roller 25.
  • the carrier-removing roller 28 efficiently removes the carrier solvent which, when the toner is melted and integrated on a portion of the intermediate transfer belt 24 looped around the heating roller 25, separates from a molten toner resin component and floats on the surface of the toner layer, thereby preventing a deterioration in efficiency and image during transfer of each of the second color toner and other color toners.
  • the carrier-removing roller 28 removes the carrier solvent while the toner layer on the intermediate transfer member is heated to a temperature equal to or higher than at least the glass transition point to thereby be melted.
  • the carrier-removing rollers 28 and 29 can each assume the form of a liquid absorptive roller having fine continuous foam cells formed therein to thereby enhance a function for absorbing the carrier solvent.
  • the liquid absorptive roller can be formed of, for example, special urethane sponge "WETRON" produced by Kanebo, Ltd.
  • a high-hardness roller or the like is pressed against the surface of each of the carrier-removing rollers 28 and 29 to thereby squeeze out carrier liquid, whereby the carrier liquid absorbed in the liquid absorptive carrier-removing roller can be collected.
  • the carrier-removing roller 28 which is adapted to remove a carrier during heating and which has a surface coated with a fluorine-containing resin coating or fluorine-containing resin tube having excellent releasability, can be brought in rotational contact with the belt surface such that the surface thereof moves at the same speed in the same direction as does the belt surface, thereby preventing "offset phenomenon," in which adhesiveness of the molten toner causes the molten toner to be transferred onto the surface of the carrier-removing roller 28 at a portion of the carrier-removing roller 28 which is looped around the heating roller 25.
  • the carrier-removing roller 28 has an unillustrated blade or counter roller in contact with the same and adapted to scrape off the carrier solvent from the same.
  • the carrier-removing roller 29 for removing a carrier after heating or particularly the carrier-removing roller 28 for removing a carrier during heating
  • the temperature of the carrier-removing roller 29 or 28 increases gradually.
  • adhesiveness of the molten toner causes the molten toner to be transferred onto the roller surface (offset phenomenon).
  • the carrier-removing roller can be cooled so as to be maintained at room temperature.
  • the carrier-removing roller can assume the form of a pipe roller through which air or cooling water flows to thereby accelerate release of heat.
  • a pipe material is preferably aluminum or copper, which exhibit excellent thermal conductivity.
  • the carrier-removing roller can assume the form of a semiconductive roller having a resistance of 10 6 ⁇ to 10 10 ⁇ .
  • a bias voltage of, for example, 1 KV to 3 KV is applied to the carrier-removing roller such that an electric field established at a nip portion causes the molten toner to moved toward the belt.
  • the charged molten toner in the carrier solvent is shifted toward the belt by means of electric-field action, thereby achieving resistance to offset onto the roller and effective removal of the carrier.
  • a carrier-removing roller 28 which serves as means for removing the carrier solvent from the intermediate transfer member while the toner layer on the intermediate transfer member is being melted through application of heat, is disposed at a position where the toner layer is melted through application of heat.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Wet Developing In Electrophotography (AREA)

Claims (12)

  1. Appareil électrophotographique de type à développement de toner liquide, dans lequel une pluralité de couleurs d'images de toner sont par la suite transférées à partir d'un élément photosensible (10) sur un élément de transfert intermédiaire (24) et dans lequel des images de toner transférées sur l'élément de transfert intermédiaire (24) sont fondues par application de chaleur et transférées sur un support d'impression,
    caractérisé par le fait que l'élément de transfert intermédiaire (24) est une courroie de transfert intermédiaire (24) bouclée autour d'un rouleau de tension (27) et d'un rouleau chauffant (25) pour chauffer et transférer l'image de toner, un rouleau (28) de retrait de véhicule pour retirer des solvants de véhicule non volatils restant dans les images de toner sur la courroie de transfert intermédiaire (24) alors qu'une couleur des images de toner est transférée sur la courroie de transfert intermédiaire (24) à une position où l'image de toner sur la courroie de transfert intermédiaire (24) est fondue par application de chaleur par le rouleau chauffant (25).
  2. Appareil électrophotographique de type à développement de toner liquide, selon la revendication 1, dans lequel un rouleau (29) de retrait de véhicule pour retirer des solvants de véhicule non volatils restant dans les images de toner sur la courroie de transfert intermédiaire (24) après qu'une couleur des images de toner est transférée sur la courroie de transfert intermédiaire (24) à une position située en aval d'une position où l'image de toner sur l'élément de transfert intermédiaire (24) est fondu par application de chaleur par le rouleau chauffant (25) et en amont d'une position où l'image de toner fondue vient à nouveau en butée contre l'élément photosensible (10).
  3. Appareil électrophotographique de type à développement de toner liquide, selon la revendication 2, dans lequel le rouleau de retrait de véhicule (21, 29) comprend un rouleau ayant une surface qui vient en contact avec une surface de l'élément de transfert intermédiaire (24) et se déplace à la même vitesse dans la même direction que la surface de l'élément de transfert intermédiaire (24), et une lame ou un contre-rouleau en contact avec le rouleau et apte à retirer par grattage le solvant de véhicule.
  4. Appareil électrophotographique de type à développement de toner liquide, selon l'une des revendications 1 ou 2, dans lequel le rouleau de retrait de véhicule (28, 29) comprend un rouleau d'absorption de liquide ayant des cellules de mousse continues formées dans celui-ci.
  5. Appareil électrophotographique de type à développement de toner liquide, selon la revendication 2, dans lequel le rouleau (29) de retrait de véhicule comprend un rouleau ayant une surface qui vient en contact avec une surface de l'élément de transfert intermédiaire (24) et se déplace dans une direction contraire à celle dans laquelle la surface de l'élément de transfert intermédiaire (24) se déplace, tout en maintenant un contact souple avec la surface de l'élément de transfert intermédiaire (24).
  6. Appareil électrophotographique de type à développement de toner liquide, selon la revendication 5, dans lequel le rouleau est formé de telle sorte que la surface d'une matière moussée est revêtue par un tube de résine contenant du fluor.
  7. Appareil électrophotographique de type à développement de toner liquide, selon la revendication 4, dans lequel le rouleau est en contact avec une partie renflée de la courroie.
  8. Appareil électrophotographique de type à développement de toner liquide, selon la revendication 2, dans lequel le rouleau (29) de retrait de véhicule comprend un rouleau ayant une surface revêtue par une résine contenant du fluor ou revêtue par un tube de résine contenant du fluor ayant une excellente aptitude au retrait.
  9. Appareil électrophotographique de type à développement de toner liquide, selon la revendication 2, dans lequel le rouleau (29) de retrait de véhicule comprend un rouleau qui est refroidi par un moyen de refroidissement (23).
  10. Appareil électrophotographique de type à développement de toner liquide, selon la revendication 9, dans lequel le rouleau revêt la forme d'un rouleau tube, et le moyen de refroidissement (23) prend la forme d'un moyen pour amener de l'air ou de l'eau de refroidissement à s'écouler à travers le rouleau tube.
  11. Appareil électrophotographique de type à développement de toner liquide, selon la revendication 2, dans lequel le rouleau (29) de retrait de véhicule comprend un rouleau semi-conducteur ayant une résistance de 106 Ω à 1010 Ω, et une tension de polarisation est appliquée au rouleau dans une direction telle qu'elle déplace l'image de toner fondue vers l'élément de transfert intermédiaire.
  12. Appareil électrophotographique de type à développement de toner liquide, selon la revendication 2, dans lequel le rouleau (29) de retrait de véhicule comprend un rouleau ayant une surface revêtue par une résine contenant du fluor ou un tube de résine contenant du fluor ayant une excellente aptitude au retrait.
EP00944302A 1999-07-07 2000-07-06 Dispositif electrophotographique de developpement de liquide colorant Expired - Lifetime EP1120692B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP19253199A JP3810953B2 (ja) 1999-07-07 1999-07-07 液体トナー現像方式の電子写真装置
JP19253199 1999-07-07
PCT/JP2000/004509 WO2001004708A1 (fr) 1999-07-07 2000-07-06 Dispositif electrophotographique de developpement de liquide colorant

Publications (3)

Publication Number Publication Date
EP1120692A1 EP1120692A1 (fr) 2001-08-01
EP1120692A4 EP1120692A4 (fr) 2002-08-21
EP1120692B1 true EP1120692B1 (fr) 2009-03-11

Family

ID=16292839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00944302A Expired - Lifetime EP1120692B1 (fr) 1999-07-07 2000-07-06 Dispositif electrophotographique de developpement de liquide colorant

Country Status (5)

Country Link
US (1) US6466756B1 (fr)
EP (1) EP1120692B1 (fr)
JP (1) JP3810953B2 (fr)
DE (1) DE60041751D1 (fr)
WO (1) WO2001004708A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1286230A4 (fr) * 2000-04-21 2008-04-09 Pfu Ltd Appareil electrographique de developpement liquide
US6996361B2 (en) 2002-01-30 2006-02-07 Pfu Limited Full-color electrophotographic apparatus using liquid toner containing resin
KR100400020B1 (ko) * 2002-02-05 2003-09-29 삼성전자주식회사 비휘발성 잉크 캐리어를 사용하는 습식 전자사진화상형성장치
US6816693B2 (en) * 2002-09-13 2004-11-09 Samsung Electronics Co. Ltd. Apparatus and method for removing carrier liquid from a photoreceptor surface or from a toned image on a photoreceptor
JP2004333633A (ja) * 2003-05-01 2004-11-25 Pfu Ltd 液体電子写真装置
US7333754B2 (en) * 2003-09-17 2008-02-19 Seiko Epson Corporation Image forming apparatus and method using liquid development
KR100574521B1 (ko) 2004-12-14 2006-04-27 삼성전자주식회사 화상형성장치
JP4925183B2 (ja) * 2006-12-21 2012-04-25 株式会社リコー 画像形成装置
US8185020B2 (en) 2007-07-31 2012-05-22 Konica Minolta Business Technologies, Inc. Image forming apparatus and method for forming image with fine pigment and thermoplastic fine resin particles in a carrier liquid
JP2009053584A (ja) * 2007-08-29 2009-03-12 Konica Minolta Business Technologies Inc 画像形成装置及び画像形成方法
JP6032116B2 (ja) * 2013-04-25 2016-11-24 コニカミノルタ株式会社 湿式画像形成装置
NL2012525C2 (en) * 2013-06-28 2015-01-05 Xeikon Ip B V Digital printing apparatus and printing process.
JP6519394B2 (ja) * 2015-08-05 2019-05-29 富士ゼロックス株式会社 定着装置及び画像形成装置
JP6906931B2 (ja) * 2016-11-28 2021-07-21 キヤノン株式会社 画像形成装置
WO2018157928A1 (fr) 2017-03-01 2018-09-07 Hp Indigo B.V. Réduction d'artéfacts de mémoire de couverture

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5681870A (en) * 1980-08-11 1981-07-04 Canon Inc Eliminating method of excessive developer
JP2763290B2 (ja) * 1987-02-04 1998-06-11 キヤノン株式会社 定着ローラ及び定着装置
US5592269A (en) * 1993-03-26 1997-01-07 Indigo N.V. Imaging system having an intermediate transfer member
US5150161A (en) * 1991-04-09 1992-09-22 Olin Corporation Color printing apparatus and process using first and second transfer surfaces
NL9101395A (nl) * 1991-08-16 1993-03-16 Oce Nederland Bv Inrichting voor het overdragen van een tonerbeeld van een beeldvormingsmedium naar een ontvangstmateriaal.
JPH06242658A (ja) * 1993-01-27 1994-09-02 Toray Ind Inc 電子写真プリンタおよび電子写真プリント方法
US5689780A (en) * 1993-01-27 1997-11-18 Toray Industries, Inc. Electrophotographic color printing apparatus using successively engageable developing units
JPH07175331A (ja) * 1993-12-20 1995-07-14 Sony Corp 画像形成装置
US5519476A (en) * 1995-06-07 1996-05-21 Xerox Corporation Liquid electrophotographic reproduction machine having a desired abrasion fix level
US5723251A (en) * 1997-01-21 1998-03-03 Xerox Corporation Method and apparatus for removing liquid carrier in a liquid developing material-based electrostatographic printing system
DE69836372T2 (de) * 1997-08-27 2007-10-11 Pfu Ltd. Elektrophotographische vorrichtung mit nassentwicklung
JPH1165290A (ja) 1997-08-27 1999-03-05 Pfu Ltd 湿式電子写真装置
EP0997792A4 (fr) * 1998-03-25 2007-05-02 Pfu Ltd Appareil d'electrophotographie humide
JP3727796B2 (ja) 1999-02-04 2005-12-14 株式会社Ｐｆｕ 湿式電子写真装置

Also Published As

Publication number Publication date
US6466756B1 (en) 2002-10-15
WO2001004708A1 (fr) 2001-01-18
JP2001022186A (ja) 2001-01-26
EP1120692A4 (fr) 2002-08-21
DE60041751D1 (de) 2009-04-23
EP1120692A1 (fr) 2001-08-01
JP3810953B2 (ja) 2006-08-16

Similar Documents

Publication Publication Date Title
US6745002B2 (en) Liquid-development electrophotographic apparatus
EP1120692B1 (fr) Dispositif electrophotographique de developpement de liquide colorant
EP0437546B1 (fr) Procede et appareil d'imagerie au moyen d'un element de transfert intermediaire
JP3459921B2 (ja) 中間転写部材を有する結像装置
EP0577597A1 (fr) Systeme d'imagerie muni d'elements de transfert intermediaires.
JP3721048B2 (ja) 液体現像電子写真装置
EP0609966B1 (fr) Système de formation d'images avec un élément de transfert intermédiaire
JP3871170B2 (ja) 湿式電子写真装置
JP3615461B2 (ja) 液体現像電子写真装置
KR930003618B1 (ko) 인사(印寫) 장치
KR100394380B1 (ko) 습식형 현상장치 및 그것을 이용한 화상 형성장치
WO1992017825A1 (fr) Systeme d'imagerie muni d'elements de transfert intermediaires
JP3727796B2 (ja) 湿式電子写真装置
JP4082446B2 (ja) 静電潜像の液体現像装置
JP2000029319A (ja) 湿式電子写真装置
JP3521975B2 (ja) 静電潜像の液体現像装置
JP2003195643A (ja) 液体現像電子写真装置
JP3703158B2 (ja) 静電潜像の液体現像装置
JPH08137277A (ja) 画像形成装置
JP4193919B2 (ja) 静電潜像の液体現像装置
JP2003280397A (ja) 湿式電子写真印刷方法及び装置
JP2001305886A (ja) 液体現像電子写真装置
JP3947235B2 (ja) 静電潜像の液体現像装置
JP4210345B2 (ja) 静電潜像の液体現像装置
JP2003195710A (ja) 電子写真装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20010409

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

A4 Supplementary search report drawn up and despatched

Effective date: 20020704

AK Designated contracting states

Kind code of ref document: A4

Designated state(s): DE FR GB

RIC1 Information provided on ipc code assigned before grant

Free format text: 7G 03G 15/10 A, 7G 03G 21/00 B, 7G 03G 15/16 B, 7G 03G 15/11 B

17Q First examination report despatched

Effective date: 20051215

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 60041751

Country of ref document: DE

Date of ref document: 20090423

Kind code of ref document: P

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20090720

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20090724

Year of fee payment: 10

Ref country code: DE

Payment date: 20090731

Year of fee payment: 10

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20091214

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20100706

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20110331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110201

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 60041751

Country of ref document: DE

Effective date: 20110201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100802

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100706